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' CARRIAGE SHIFTING MECHANISM Original Filed Nov. 25, 1940 15 Sheets-Sheet 15 INVEN TOR. Ham/0 Z'A Ve/ A'I'TORNE YS Patented May 27, 1947 CARRIAGE SHIFTING .-MEOHANISM Harold T. Avery, Oakland, Calif "assignor to Mam-chant Calculating Machine Company, a corporation of California Original application November 25, 1940, .Serial No. 367,025. Divided and this application July 10, 1943, Serial No. 494,214

7 Claims. 1

The present invention relates to calculating machines and more particularly to mechanism for shifting the carriage'of ahan'd operated machine such as the type disclosed in the copending Avery application, Serial Number 367, 025, filed November 25, 1940 (Patent No. 2,377,065) of which this application is a division.

It is customary in hand operated calculating machines to provide a shift mechanism which is operable separately from the actuating mechanisin either by a separate manual shifting member 01' by the hand crankduring a separate shift cycle following a multicyclicoperation of the actuating-mechanism. Applicant on the-otherhand contemplates the provision of a shift mechanism which may be selectively operated during the latter part of each cycle of the hand crank, the arrangement being such that the hand crank first drives the actuating mechanism through a variable number-of cycles for each single cycle of the hand crank in either direction and then effects a single shift cycle, regardless of the number of actuator cycles or the direction of operation of the hand crank and actuators.

The machine embodying the present invention also includes a manually adjustable member whereby the operator may enable or disable the shift mechanism at will, and to thereby enable the hand crank to effect an actuator cycle without a shift cycle, or a shift cycle without'a'n actuator cycle.

The present inventionalso includes'a shift control lever which is settable to a right shift position,-to a left shift position or to an intermediate non-shift position, to enable the hand crank to shift the carriage to the right or left respectively during the latter part of each hand crank turn, or to prevent the hand crank from shifting the carriage at all, the arrangement being such that if the lever is set to its non-shift position, the operator may operate the hand crank to drive the actuator through different numbers of cycles as determined by the setting of a selector to selected ones of a plurality of digital positions. When the'selector is set to a zero' position, however, means are put into operation durin the first part of the hand crank cycle to condition the shift mechanism for shifting the carriage "to the left and to thereby enable the hand crank to actuate the shift mechanism during the latter part of the same handcrank cyc1e,'the shift conditioning means being rendered ineffective at the end of the hand crank cycle to enable returnof the "s'hi'ft control mechanismau'tornatically 'to nonshin; position.

It is therefore a principalob'jcct ofthe invention to provide improved means for selectively disabling and enabling the shift mechanism for hand-operated calculating machines.

It is a further objectof the'inventionto provide novel control means capable of selecting the -number of cyclesof the actuator mechanism or alternatively conditioning the shift mechanism -for=operation.

It is a further object of the invention to shift the carriage during the latter partof the same hand-crank cycle used for driving the actuator and to so shift the carriage in 'a given direction regardless of the direction "of operation of the hand-crankandthe'actuator.

Other objects will appear from the following detailed description of a preferred embodiment of the invention reference being had to the accompanying drawings forming a part 'of this specification in which:

Figure 1 is atop exterior'view of the machine, ShOWil'lg the location of the various control members.

Figure '2 is a detailed section, as viewed from theright, 'shOWing the members'which constitute the centralizing sand interlocking means for the selective speed transmission unit.

Figure 3 is a longitudinal section, .as viewed from the right showing the general arrangement of the parts of themachine.

,Figure 4 ,is a longitudinal section, as viewed fromthe right,.showing part of the selectionand actuationmechanism.

Figure 5 is a lateral section taken on the line V-V of Figure 4.

Figures 6 to-9, inclusive, aredetail views of the selection control devices shown in Figures 4 and 5.

:Figure 10 is a-developed plan -view,,partly-sohematic and'partly in section ,of the selective speed transmission unit, its drive to the actuator and related mechanisms.

Figure 11 is a front view-of the members which control the selective transmission unit.

Figure 12 is a sectional view taken on the line XII-XII- of Figure 13.

Figure 13 is a right side view of the linkage between the control members s'hown inFigure 11, and the selective transmission shaft.

Figure 1.4 is a right side view 'ofithe mechanism for releasing and for locking the actuator drive gears.

Figure "15 is a right :side view of the actuator centralizerxand the means for locking the-actuator in full cycle position, vand the interlocking means between the actuator and the carriage dipping mechanism.

Figure 16 is a right side view of the mechanism for locking the selection levers in position while actuation is taking place.

' Figure 17 is a section through the carriage, as viewed from the right, showing the mechanism for tapping the bell to indicate an overdraft.

Figure 17A is a detailed view of means for returning a particular shaft to its normal position.

Figure 18 is an enlarged view, partly in section, of two orders of the accumulator, showing the construction thereof.

Figure 19 is a section through the carriage, as viewed from the right, showing the lever and related mechanism by which the carriage may be freely traversed in either direction.

Figures 20 and 23 are sections taken through the carriage to illustrate the construction of the accumulators, the section being taken so as to bring out the inter-action and relationship between certain of the parts.

Figure 21 is a top view of the shift centralizer.

Figure 22 is a top view of the driving means between the shift mechanism and the traversable carriage.

Figure 2a is a section taken on the line XX1V XXIV of Figure 26.

Figure 25 is a front view of the mechanism shown in Figure 24.

Figure 26 is a right side view of the manual and automatic means for controlling and actuating the shifting mechanism.

Figure 27 is a right side view of the mechanism for actuating the counter register and the means for reversing the same.

Figure 28 is a section of the counter reverse unit, as viewed from the rear, showing the means for reversing the action of the counter finger.

Figure 29 is a detail view of the cams and related mechanism which condition the clearing m chanism.

Figure 30 is a right side View of the clearing mechanism and the connections therefrom to the shafts which effect clearance of the registers.

Modified embodiment Figure 31 is a section, as viewed from the right, showing an alternative arrangement for retaining the carriage drive gears in mesh with the actuator for a plurality of actuating cycles.

Figure 32 is a section, as viewed from the right, showing an alternative arrangement for rocking the ordinal cam followers clear of the dial cams during plus actuation.

Figure 33 is an enlarged sectional view, taken on the line XXXIIIXXXIII of Figure 31.

Certain of the primary units of the machine embodying the present invention are either taken wholly or slightly altered from the showing in the Avery Patent Number 2,271,240, issued January 27, 1942. These units will, therefore, be only generally described.

Key setting and actuating mechanism The numeral keys i (Figure 1), by means of which the factors are entered into the machine, are arranged in parallel banks of ten keys each, one such bank being shown in Figure 4. Each key is mounted on a key stem I 6, which is vertically slidable in the slots 1 and 8 in the key bank frame 9. The key stems are normally maintained in raised position by springs 6 compressed between a boss 4 on frame 9 and an opposite lug 5 on the key stem, the body of the key stem being cut away, as shown at 3 in Figure 5, to receive the spring and to provide a cross-bar. Spring clips 3D embrace the key stems l3 adjacent the under-side of the top or" frame member 9 and constitute a cushioning stop for arresting the rise of the keys under the influence of springs 6.

Each key bank frame 9 is mounted in the machine on cross-bars i2 and 13, which extend between side frame members, not shown, and screw 15 extending through the bar i2 into contact with each frame -9 may be adjusted so as to correctly position the key frame, which may then be fixed by means of screw 11 extending through a slot in frame 9 into bar 13.

Means are provided for latching depressed value keys in depressed position. Rollers 8? and SS journaled in members 89 and 26, depending from frame 9, support a plurality of longitudinally slidable bars, including alock bar (Figures 4 and 5), provided with cam faces 9| underlying each of the key stem cross bars whereby depression of any key will move the bar 43 to the left, as viewed in Figure 4. Underlying all of the key stems, except that of the zero key, situated at the left of Figure 4, the bar 49 is also provided with latching hooks 32 so that as the cross-bar of the key stem passes below the hook G2 the bar 45 may return to the right, as viewed in Figure 4, to latch the key in depressed position. Spring 93 serves to return the lock bar 49 to the right in such operations.

Means are provided for indicating upon ligned numeral wheels the amount to which the selecting mechanism is set by depression of the keyboard keys. Also, supported upon the rollers 8! and 33 is a longitudinally slidable check dial bar 50 provided with nine evenly spaced notche 59, each having a bottom portion designed to receive the cross-bar of the overlying key stem !8 and divergent sides designed to be engaged by the lower end of said key stem, so that the bar will be moved longitudinally as the key is depressed. The spacing of the notches 59 is slightly less than the spacing of the key stems l5, so that upon depression of any value key the bar 50 will be cammed to the right (as viewed in Figure 4), a distance proportional to the value of the key depressed. The bar 50 does not extend under the zero key, however, and is not aifected by depression thereof.

The check dial bar 59 is thus given differential movement proportional to the value of the key depressed and this differential movement is transmitted to the check dial 52, rotatably mounted with other similar check dials on a shaft 53, extending across all decimal orders of the keyboard, so that numerals on the periphery of the dials 5 will be exposed through the sight openings 68.

Each check dial 52 has fixed thereto a pinion 55 operating in engagement with a segment 51 formed on one end of a lever 58 pivoted in the frame of the machine at 6'! and provided with a pin 6|, which is engaged by a notch in the check dial bar 59. A spring 9311, tensioned between an ear on the lever 58, and a stud 96 on the machine frame urge the lcver 58 clockwise about its pivot and thus normally maintain the parts in the position in which they are shown in Figure 4, in which a stop member 91 fixed to each dial 52 bears against one of the teeth of a comb 98 fixed in the machine frame to limit counter-clockwise rotation of the dial 52 to the point at which the zero numeral thereon is exposed through the sight opening 68. Depression of any value key will, therefore, by imparting a differential movement proportional to the value of the key to bar 50 and lever 58, rotate dial 52 clockwise to expose through the sight opening 88 a digit indicating the value of the depressed key,

As described in the Avery patent, above referred to, the selection mechanism of the aforesaid type of Marchant machine comprises three shafts I69, 581, and I63, hereinafter referred to as the half, quarter, and twelfth speed shafts, respectively, common to all decimal orders of the machine. These shafts are connected to a selective ratio transmission described in said Avery patent, so that shaft I59 rotates through 180 for each cycle of operation of the machine, while shaft I68 rotates through 30 for each such cycle of operation. In each decimal order a sleeve I19 is rotatably mounted on a shaft I disposed adjacent the aforesaid actuating shafts, and each sleeve I18 has keyed thereto a plurality of gears through which the several orders of the registering mechanism are driven.

Means are provided for connecting each sleeve I19 to the actuator gear trains so that it can be either locked or driven by one of the three shafts I66, I61, or I98 at any of nine different rates with respect to the driving means, said rates corresponding to the values delineated upon the keys I5. Since this mechanism is repeated in each decimal order of the machine, only one such order need be described in detail.

As shown in Figure 4, a gear MI is keyed to sleeve I19 and there is mounted to oscillate freely on a spacer mounted on said sleeve alongside gear 4', a selection plate 412 having rotatably mounted thereon an idler gear 413 and an idler gear 414 entrained with gear 41I. Keyed to the half speed shaft I86 and in radial alignment with gear 413 is a twelve-tooth gear 415, while in radial alignment with gear 418 on its opposite side is a twenty-tooth gear 416 keyed to the quarter speed shaft I61. Thus, if plate 412 is swung to the right (as viewed in Figure 4), gear 413 will be brought into mesh with gear 416, whereupon the 90 rotation of shaft I61 during each cycle of operation of the machine will advance the gear 41I five teeth; while if plate 412 is swung to the left, gear 413 will be carried into mesh with gear 415 and the 180 rotation of shaft I66 will advance the gear 41I six teeth during each cycle of operation of the machine. By this means, either a five or a six selection may be effected.

Also, keyed to the sleeve I19 is gear 411 (Figure '1 and mounted for oscillation on a spacer carried by said sleeve alongside of this gear, is a selection plate 418 on which are mounted idler gears 419 and 489, which are entrained with gear 411. Keyed to shaft I89 in radial alignment with idler 419 is a fourteen-tooth gear 48I, and keyed to shaft I81 in radial alignment with idler 419 is a sixteen-tooth gear 482. Thus, when the selection plate 418 is swung to the right (as viewed in Figure '7), its idler 419 will mesh with the gear 482 and the 90 rotation of shaft I61 in each cycle will serve to advance the gear 411 four teeth; while when the said plate 418 is swung toward the left, idler 419 will mesh with gear 48I and the 180 rotation of shaft Hit in each cycle will serve to advance the gear 411 seven teeth. By this means, either a seven or a four selection may be effected.

Also, keyed upon sleeve I 18 (Figure 6) is a and mounted to oscillate freely upon a spacer carried by the sleeve I19 alongside this gear is a selection plate 484, similar to those above described, and carrying idlers 485 and 489. Keyed to shaft 188 in radial alignment with idler 485 is a sixteen-tooth gear 481, and keyed to shaft I61 in radial alignment with idler 485 is a twelve-tooth gear 488. Thus, when plate 484 is swung to the left (as viewed in Figure 6) its idler 485 will mesh with gear 481 and the 180 rotation. of shaft I68 in each cycle will serve to advance the gear 483 eight teeth; while when plate 484 is swung toward the right, idler 435 will mesh with gear 488 and the rotation of shaft I61 in each. cycle of operation will serve to advance the gear 483 three teeth. By this means, either an eight or a three selection may be effected.

Also, keyed to the sleeve I19 is a broad faced gear Hi9 (Figure 9), and freely mounted for oscillation on a spacer carried by the sleeve I19 on one side of this gear is a selection plate 498, similar to those above described, and mounting idlers 299 and 29!. Keyed to shaft I66 in radial alignment with idler 29I is an eighteen-tooth gear 493, and keyed to shaft E68 and meshing with a gear rotatably mounted upon shaft I81 in radial alignment with idler 29! is a twenty-fourtooth gear Thus, if plate 499 is swung to the left (as viewed in Figure 9), idler 29I will mesh wtih gear 493 and the rotation of the shaft in each cycle will serve to advance the gear its nine teeth; while, if the plate 498 is swung toward the right, the idler 29I will mesh with the gear 494 and the 30 rotation of shaft I68 in each cycle will drive gear 494 through gear 495 to advance the gear I89 two teeth. By this means, either a nine or a two selection may be effected.

Mounted for oscillation on sleeve I19 at the opposite side of gear I89 is another selection plate 496 (Figure 8) having mounted thereon intermeshing idler gears 49'! and 498. Gear 498 is constantly enmeshed with gear I89, while gear 4E3? may mesh with the twenty-four-tooth idler gear 498 rotatably mounted on shaft 1 61 when th 4% is swung to the right (as viewed in Figure 8-). This gear 499 is driven by a twelvetooth 298 keyed on shaft I98 so that gear fee will be advanced a single tooth upon a 30 rotation of gear 299 when plate 496 is swung to the right.

A zero selection is effected by holding gear E89 against rotation. For this purpose, a pawl 538i (Figures 4.- and S) is mounted upon a shaft 202, so that when the plate 496 is swung to the left (as viewed in Figure 8) the edge of said plate will engage an ear 283 on pawl 2M and retain said pawl in engagement with the gear I89 after the shaft 292 is rocked, as hereinafter described.

The shaft 292 extends across all orders of the machine and one pawl 20] is provided for each decimal order. At the commencement of operation, shaft 292 is rocked counter-clockwise to a limited extent by a mechanism to be presently described, and when the machine comes to rest the shaft is returned in a clockwise direction. It will be noted that pawl 2III is provided with narrow keys 294 lying in wider key-ways in the shaft 292, and, therefore, when some value other than zero is selected in a given order the initial counter-clockwise rocking of shaft 292 will free pawl 264 so that upon rotation of sleeve 419 the gear 89 may rock its associated pawl 26! out of the way. However, if a zero is selected in a particular order, the associated plate engaging the lug 2533 of the pawl Zill, as previously explained, will retain the pawl in engagement with the gear 589, notwithstanding the counter-clockwise movement of the shaft 292, because the key-way in which the keys 204 are engaged is wide enough to permit such limited rocking movement of the shaft 292 as is necessary in this operation. By this arrangement, when the selection plate 496 is swung toward the left, as viewed in Figure 8, the gear 139 is locked and the zero selection is eiiected.

It will be apparent from the foregoing that one of the five selection plates in each order is positioned during a selection operation to select either a numeral value or zero, while the remaining four plates of that order are held in idle position. The value positions are positions in which the plate-carried gears mesh with gears on shafts 566 or 551, while the idle position is the intermediate position of the plates in which no such connection is effected. Thus, if a six is to be selected, by way of example, plate 4'12 (Figure 4) will be swung to the left to engage gear 415, while all the other plates will be held in intermediate positions.

The selection plates are set to the several valueselecting and intermediate idle positions, above described, by a series of longitudinally adjustable selection bars supported upon rollers 81 and 83 (Figure 4 alongside the previously described locking bar 49 and check dial bar 50 of each key bank.

For the purpose of efiecting a zero or one selection, the plate 495 (Figure 8) is connected to a selection bar M9 (Figures 5 and 8) supported on the rollers 81' and 88 and having an extended arm iii provided with a slot 412 engaging a pin M3 on selection plate 495, so that upon longitudinal movement of the bar M9 the plate 498 will be moved either into its zero, intermediate, or one selection position. Spring 93, tensioned between an ear es of the previously described locking bar 48 and an ear 99 of the selection bar 4H) urges the bar 419 toward the left (as viewed in Figure 8), normally maintaining stop lug 4l4 against roller 3? and selection plate 495 in its zero selection position, in which it maintains pawl 29! in locked engagement with gear I89. The upper edge of bar 4 i 9 is, however, provided with notches having divergent sides underlying the crossbars of each of *he key stems 45 of the two to nine Value keys, inclusive, the bottoms of said notches 456 being sufficiently offset from the lower ends of the key stems to cause the latter to bar: 353 to the right a suiiicient distance to move the plate 499 into its intermediate position when one of these keys is depressed.

A similar notch H1 underlies the cross-bar of the key stern I 6 associated with the one value key, but the bottom of said notch is ofiset from the bottom of said key stem a sufficient distance to cause the depression of said key to cam the bar did to the right a suificient distance to carry the gear 49? mounted on plate into mesh with gear 499 thus effect a one selection as above described. For the purpose of eifecting positive restoration of the plate 493 into its zero selection position upon depression of a Zero key, a notch 4 i8 underlies the cross-bar of the stem lb of the zero key of each key bank and is provided with one divergent edge adapted to cause the bar 4H) to be cammed to the left a sufficient distance to positively move the plate into its zero selection position upon depression of the zero key.

ihe positioning of the selection plate 499, by means of which either a nine or a two selection may be effected, as above described, is controlled by selection bar 429 (Figures 5 and 9) having an arm extension 421 provided with a slot 422 engaging a pin 423 on a selection plate 490, so that upon longitudinal movement of the bar 420 the plate 490 may be moved into its nine selection, intermediate, or two selection positions. When neither the nine nor the two key is depressed, the bar 420 and its connected plate 499 are maintained in their intermediate position by extensions 424 and 425 of the bar 429 which abut opposite sides of th nine key and the two key, respectively, to prevent longitudinal movement of the bar 420 so long as both of these keys are in raised position.

Underlying the nine' key, the bar 420 is provided with a notch 426 having an angular edge 42'. adapted to be engaged by the cross-bar of the stem 56 of the nine key, upon depression thereof, to cam the bar 426 to the left (as viewed in Figure 9) and move the plate 49%] to carry its gear 29! into mesh with the gear 493 for the purpose of effecting a nine selection as above described. Upon release of the nine key from depressed position, the upper edge of its cross-bar is adapted to be brought into contact with the surface on the extension 424 to return the plate 4% to intermediate position.

Underlying the two key, the bar 420 is provided with a notch 428 having an angular side 429 adapted to be engaged by the stem. 16 of the two key upon depression thereof to earn the bar 420 to the right (as viewed in Figure 9), moving plate 49;; to bring its gear 29| into mesh with the gear to eiiect a two selection as above described. Upon release of the two key from depressed position, the upper edge of its cross-bar is adapted to contact a cam surface on the underside of the extension. to move the bar 428 and its attached plate 492 to intermediate position.

he positioning of the selection plate 484 (Figure 6) to effect an eight or three selection, as hereinabove described, is controlled by a Selection bar 430 (Figures 5 and 6) having an extension arm 43! provided with a slot 432 engaging a pin 433 on the plate 435, so that upon longitudinal movement of the bar 430 on rollers 81 and 88 the plate may be moved into its eight selection, intermediate, or three selection posi tions. The bar 436 and selection plate 484 are normally maintained in their intermediate positions by means comprising extensions 434 and 435 of plate which abut opposite sides of the stems of the eight and three keys, respectively, so that no substantial longitudinal movement of the bar 438 is possible unless one of these keys is depressed.

Underlying the stem l6 of the eight key is a notch 436 having a divergent edge 43'! adapted to be contacted by the stem of the eight key upon depression thereof to cam the bar 430 to the left (as viewed in Figure 6) and carry the gear 495 mounted on selection plate 484 into mesh with the gear 48? to effect an eight selection, as hereinabove described. Upon release of the eight key from depressed position the upper edge of its cross-bar is adapted to contact a cam surface on the underside of extension 434 to return the bar 439 and selection plate 84 to intermediate position as the key rises.

Underlying the stem of the three key is a notch 438 provided with a divergent edge 439 adapted to be contacted by the stem of the three key upon depression thereof to cam the bar 430 to the right (as viewed in Figure 6) and carry gear 485 on plate 484 into mesh with gear 488 to effect a three selection, as above described. Upon release of the three key from depressed position, the upper side of its cross-bar is adapted to con- 9 tact a cam surface on the underside of extension 435 and return the bar 30 and plate 384 to intermediate positionas the key rises.

The positioning of the selection plate 418 (Figure '2) to effect a seven or a four selection, as hereinabove described, is controlled by a bar 44h having an extension arm 44! provided With a slot 442 engaging a pin 43 on the plate M8, so that upon longitudinal movement of the bar 449 on rollers 82' and 88 the plate 43'! be moved into its seven selection, intermediate, or four s lection positions. The bar 44% and its onnected plate M8 are normally maintained in intermediate position by means comprising extensions 444 and 445 of bar 4% which abut opposite sides of the stens iii of the seven and the four keys, re-

spectively, so as to prevent any substantial longitudinal movement of the bar so long as both of these keys are in raised position.

Underlying the stem E6 of the seven key is a notch 445 having a divergent edge 44'! adapted to be contacted by the stem of the seven key upon depression thereof to cam the bar 440 to the left (as viewed in Figure 7) and carry the gear did mounted on plate 518 into mesh with the gear 58! to efiect a seven selection as hereinabove described. Upon release of the seven key from depressed position, the upper edge of its crossbar is adapted to contact a cam surface on the underside of extension 544 and move the bar 5.45 and its connected plate 418 to intermediate position as the key rises.

Underlying the stem It of the four key is a notch 448 provided with a divergent edge 449 adapted to be contacted by the stem of the key upon depression thereof to cam the bar 440 to the right (Figure '7) and carry gear 419 into mesh with gear 432 to effect a four selection, as hereinabove described. Upon release of the four key from depressed position, the upper edge of its cross-bar is adapted to contact a camsurface on the underside of extension 445 to move the bar @5 8 and its connected plate 418 to intermediate position as the key rises.

The positioning of the plate 412 (Figure 4) to eifect a five or a six selection, as hereinabove described, is controlled by a selection bar 450 having an extension arm I6I provided With a slot 562 engaging a pin 63 on plate 412 so that upon longitudinal movement of bar 456 on rollers 81 and 538 the plate 4'i2 will be moved into its five selection, intermediate, or six selection positions. Bar 45! and its connected plate 4'i2 are normally maintained in intermediate position by means comprising extensions abutting opposite sides of the stems of the six and five keys, respectively, to prevent any substantial longitudinal movement of the bar 450 so long as both of these keys are in. raised position.

Underlying the stem I 6 of the six key is a notch having a divergent edge I51 adapted to be contacted by a stem of the key on depression thereof to cam the bar 453 to the left (as viewed in Figure i) and move the gear 473 on plate 412 into mesh with the gear 415 to effect a six selection, as hereinabove described. Upon release of the six key from depressed position, the upper edge of its cross-bar is adapted to contact a cam surface on the under-side of extension I64 to move the bar 459 and its connected plate 412 to intermediate position as the key rises.

Underlyin the stem I6 of the five key is a notch 452 having a divergent edge I59 adapted to be contacted by the stem of the key upon depression thereof, to cam the bar 450 to the right 564 and IE5 of bar 450 iii.

(as viewed in Figure-4) and carry the gear 413 on plate 412 into mesh with the gear 416 to effect a;five-selection, as hereinabove described. Upon release of the key from depressed position the upper edge of its cross-bar is adapted to contact a cam surface on the underside of extension I to move the bar 450 and its connected plate 412 to intermediate position as the key rises.

Depression of any value key in a given blank serves to release any previously depressed key in the same bank, and if the previously depressed key is associated with a different selection bar to positively return such selection bar and the plate associated therewith to intermediate position. If the previously depressed key is associated with the same selection bar, the said bar will be reset through its intermediate position to a new selection position.

For this purpose, each of the selection bars 42s, 4313, 440, and 459 (Figures 4, 6, '7, and 9) is provided with a plurality of notches 455, which when the said selection bars are in their intermediate position underlie the stems of the value keys other than those adapted to move the respective selection bars into active position. Each of the notches 4-55 is provided with divergent edges 454 adapted to be contacted by the crossbar of a depending key stem I5, so that the latter will cam the bar longitudinally in either direction to intermediate or idle position, as the key is depressed. If a given selection bar is in its intermediate or idle position as a key is depressed, the key stem It will enter directly into the notch 455 and latch the selection bar against endwise movement in either direction.

Thus, it will be seen on reference, for instance, to Figure 9 that if the nine key stands depressed a subsequent depression of the one key will not only release the nine key and permit its stem to rise under the influence of its spring 5, but the descending stem of the one key will come into contact with the cam surface 454 and positively cam the selection bar 420 to the right (as viewed in Figure 9) until it reaches its intermediate or idle position when the stem of the one key will enter the notch 455 and latch the selection bar 420 in its intermediate or idle position.

Means are provided to lock the plurality of selection plates 412, 484, 418, 496, 490 (Figures 16, 4, 6, 7, 8, and 9) in one of their three positions during the actuation period. A shaft II5 (Figure 16) is rocked counter-clockwise just before the actuation period by mechanisms explained hereinafter. A lever 183 is secured to this shaft and is connected to a lever I34 pivoted on a shaft I38. A selection locking bail is secured to lever I84 and extends across the machine so that a flange I86 thereon may be moved upwardly into one of the three notches 81 to look all the selection plates in one of the three positions described hereinbefore. After the actuation cycles are completed, the shaft I I5 is rocked back to the position shown, which rocking moves the flange I86 out of the notches I 81 so the plates may be moved to a new setting indicative of the next selection entered on the keys 15 (Figure l).

Accumulator The actuation of the numeral wheels 279 is eifected by mechanism including the'above-mentioned pivot gears I89 (Figure 3) which mesh with the gears 2H mounted in the shiftable carriage. Gears 213 mesh with the gears 2H and are integral with two plates 292 and 296 (Figure 18) between which are journaled the planetary 

